Ventilating-fan.



Patented Dec. 30, |902. W BUBROWS VENTILATING FAN.

(Application tiled July 28. 1902.)

(mi Model.)

".i l I l n mwww""ww UNITED STATES PATENT QFFICE.

WILLIAM BURROWS, OF FIRECREEK, WEST VIRGINIA.

SPECIFICATION forming part of Letters Patent No. 717,339, dated December30, 1902.

Application lel July Z8, 1902. Serial No. 117,333. (No model.)

To @ZZ whom t may concern/.-

Be it known that I, WILLIAM BURRows, of

' Firecreek, in the county of Fayette and State of West Virginia, haveinvented certain new and useful Improvements in Ventilating- Fans, ofwhich the following is a specification.

The object of my invention is to provide an improved fan for Ventilatingmines; and' the invention consists in a peculiarly-constructed fan ofthe rotary blower type, which I'Will now proceed to describe indetail,with reference to the accompanying drawings, which form a part ofthis specification, and in which- Figure l is aside View. Fig. 2 is avertical longitudinal section on line X X'of Fig. 3, and Fig. 3 is ahorizontal section on lineY Y of Fig. 1. 4

My invention, broadly stated, involves peculiar air-forcing meanscontained in a special casing having connected with it a suitableexit-pipe.

The invention may be described in detail as follows:

A indicates the casing, B the fan-blower, and C the exit or deliverypipe. The blower B and the casing A are formed with increasing taperfrom end to end, as shown in Fig. 3. The fan or blower B is supported bya shaftD and has a closed end E and an open end F. The bucketsG of theblower radiate from the shaft D and extend parallel therewith to a pointaand then curve forward to b, at which latter point they join the closedend of the blower, as shown. The buckets G are supported at the open endof the blower by arms or spokes H, having outwardly-inclined blades I.It will be noticed that the said spokes H project, as at Il', beyond therear side of the buckets. The large end of the casing A is madeair-tight,'and the small end thereof has an opening conforming to theperiphery of the reduced end of the blower B. In one side of thecasing'Aan-opening is made providing communication with the exit ordelivery pipe CL It is understood that the shaft D must have suitablesupports, such as bearings .I and that.

It will be noticed that the opening in the side of my casing A,providing communication with the exit or delivery pipe C, extendssubstantially from front to rear of the casing. (See Fig. 3.) With thespecial opening just described obviouslyincreased results are had over areduced opening in the casing of a si'milarfan-blower, since by myconstruction the air is afforded free escape, and therefore less liableto be stored up to such degree as ,will preclude effective results.

While my blower is specially designed to be used in mines for drawingair f'rom the drifts, obviously it is',adapted for other uses. Wheuusedin a mine, the reduced or open end of the casing is located at thedrift-opening and the exit-pipe extended to a point where the foul orimpure air may be delivered. Now itis apparentthat with the blowerrotating in direction indicated by arrow air will be drawn from thedrift with pressure according to rotation of the fan-blower through theopen end of the casing and forced up the exit or delivery pipe. Theaction of the blower. is assisted by the inclined blades I, which forceair inwardly through the opening in the reduced end of the casing. Theincreasing inner space in the casing from its inlet permits expansion ofthe air, and consequentlya more rapid discharge through the eXitpipe,and increased exhaust-pressure of air results in curving` the bucketsforward from a to b. Obviously asecond blower may be employed at theoutlet end of the exhaustpipe, if desired; but under ordinarycircumstances one blower of propersize will provide Y thoroughventilation.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is,-

1. The combination in a rotary blower, of a tapering casing having anenlarged closed end and an -opening in its reduced end, an opening inone side of the casing extending substantially from front to rearthereof, a delivery-pipe conforming to the said opening in vthe casing,and a blower within the casing adaptedto berotated with effect to drawair into the casing and force it through the delivery-pipe,substantially as described.

2. In a blower of the character described and in combination, a taperingair-forcing ICO fan having a closed end and an open end, radial bucketscurved forward at the closed end of the fan and substantially paralleltherefrom to its open end, spokes at the open end 0f the fan havingoutwardly-inclined blades as shown, atapering casing inclosing the fanhaving one end closed and the otherend open, and a delivery-pipeproviding open communieation with one side of the casing, substantiallyas described.

3. In an air-exhausting apparatus of the character described, incombination, a tapering fan having a closed end and an open end, bucketscurved forward at the closed end of the fan and parallel from saidcurved end t0 the open end of the fan, spokes supporting the saidbuckets at the open end of the fan, projections from each spoke with onethereof extending beyond the rear side of each bucket, and the otherextending in advance of each bucket and also inclined outwardly forminga blade adapted to gather air and force it inwardly, a tapering casinginclosing the fan having its larger end closed and an opening in itsreduced end conforming to the size of the contiguous end of the fan, andan eX- haust-pipe leading from the tapering side Wall of the casing,substantially as described.

WILLIAM BURROVVS. Vitnesses:

HORACE D. GAST, Jos. C. HAMILTON.

